<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>三级联动菜单</title>
    <script src="./三级联动.js"></script>
</head>

<body>
    省/市：<select name="province" id="province">
    </select>&nbsp;&nbsp;
    市/区：<select name="city" id="city">
    </select>&nbsp;&nbsp;
    县/镇：<select name="county" id="county">
    </select>
</body>

</html>